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1.1.1 IND Package
The IND upgrade on the QS-100IND and QS-100IND750 boards provides the
protection essential for reliable use in an industrial environment. Special line
drivers and receivers are used which have 15kV ESD (Electro Static Discharge)
protection, and each communication line has a surge suppressor capable of
sustaining up to 40A transient surges (at 14V).
1.1.2 UART Upgrade
The UART upgrade on the QS-100D750 and QS-100IND750 boards provides a
16750 UART in place of the 16550 UART found on the standard QS-100D. The
UART (Universal Asynchronous Transmiter and Receiver) takes byte size data
from the bus side of board and breaks it into the bit size data required for serial
communication. Benefits of the 16750 UART include extended 64 byte FIFOs on
transmit and receive and the ability to sustain transfer rates as high as 1Mbaud (
acheiving this rate is dependent upon the user’s system and the board’s oscillator
frequency). The increased FIFO size allows the 16750 UART to store larger
amounts data; which means that each read or write access to the UART can move
more data per operation, resulting in less processor time being spent servicing the
UART.
The Quatech serial device driver for Windows 95, which is included with the
QS-100D, provides support for the UART’s 16750 mode. Other applications
and/or operating systems may not support a UART operating in 16750 mode, in
which case the default operation will be 16550 compatible mode.
1-2 Quatech Inc.